CN-115215433-B - Oxidation channeling state precipitation method

CN115215433BCN 115215433 BCN115215433 BCN 115215433BCN-115215433-B

Abstract

The invention discloses an oxidation ditch flow state precipitation method which is applied to oxidation ditch flow states and comprises a sedimentation unit and a pushing device, wherein the sedimentation unit at least comprises a solid-liquid separator arranged between 2 stages; the method comprises the specific steps of adopting an oxidation ditch flow state self-flow rate or pushing the oxidation ditch flow state through a pushing device to enable the oxidation ditch flow state to generate a certain circulation speed, enabling mud liquid with a certain flow rate to be subjected to mud liquid separation layer by layer through solid-liquid separators in a sedimentation unit, forming circulation in a cavity area between adjacent solid-liquid separators, reducing the grain content of the mud liquid in the next-stage solid-liquid separator, discharging supernatant liquid through an effluent weir of the sedimentation unit, enabling organic matter mud liquid to flow back into a sedimentation tank through the solid-liquid separators, and achieving solid-liquid separation.

Inventors

ZHANG HUIPENG
DENG RONGSEN
WANG TAO
CHEN FENG

Assignees

水拓工程技术咨询(成都)有限公司

Dates

Publication Date: 20260512
Application Date: 20220720

Claims (3)

1. The oxidation ditch flow state precipitation method is applied to oxidation ditch flow state and is characterized by comprising a sedimentation unit and a pushing device, wherein the sedimentation unit at least comprises a solid-liquid separator arranged between 2 stages, and the specific steps are as follows: The oxidation ditch flow state self-flow speed is adopted or the oxidation ditch flow state is pushed by a pushing device, so that the oxidation ditch flow state generates a certain circulation speed; the mud with a certain flow rate is subjected to mud-liquid separation layer by layer through the solid-liquid separators in the sedimentation unit, a dynamic balance suspension layer is formed in a cavity area between adjacent solid-liquid separators, and the particle content of the mud in the next-stage solid-liquid separator is reduced; the supernatant liquid is discharged through an effluent weir of the sedimentation unit, and the organic matter mud liquid flows back into the sedimentation tank through a solid-liquid separator to realize solid-liquid separation; A first filter cavity with the size and shape matched with those of the first solid-liquid separator is arranged at the water inlet of the sedimentation unit, and the first solid-liquid separator is assembled in the first filter cavity; The sedimentation unit comprises a connecting piece, a first solid-liquid separator, a second solid-liquid separator and a shell, wherein the connecting piece is arranged on the shell, the first solid-liquid separator and the second solid-liquid separator are arranged in the shell at intervals along the flowing direction of liquid, so that a turbulent flow cavity is formed between the first solid-liquid separator and the second solid-liquid separator, and the side wall of the turbulent flow cavity forms 20-50 degrees with the side wall of the first filter cavity; The turbulent flow cavity comprises a first port and a second port, the aperture of the first port is matched with the first filter cavity, the second port is not smaller than the size of the first port, the turbulent flow cavity is in an amplifying structure, the size of the second port is matched with the second solid-liquid separator, the circulation speed of the flow state of the oxidation ditch is not lower than 0.4m/s, the height of the first solid-liquid separator is 0.5-0.8 m, the vertical distance between the first port and the second port is at least 1m, the height of the second solid-liquid separator is 0.5-1 m, the cavity structure of the turbulent flow cavity is in a circular truncated cone structure, and the side wall of the turbulent flow cavity is arranged smoothly.
2. An oxidation ditch flow sedimentation process according to claim 1, wherein the sedimentation unit bottom is at least 1m from the bottom of the sedimentation tank.
3. An oxidation ditch flow state precipitation method according to claim 2, wherein an effluent weir is provided in said housing, said effluent weir being at least 0.8m from the water outlet of the second solid liquid separator.

Description

Oxidation channeling state precipitation method Technical Field The invention relates to the field of sewage treatment, in particular to an oxidation ditch flow state precipitation method. Background The surface load is one of the design indexes of sedimentation tanks in water-supply and water-treatment plants. When a suspended particle is precipitated during a theoretical residence time through a distance exactly equal to the depth of the bath, its sedimentation rate is called overflow rate or surface loading rate. In the prior art, a sedimentation tank is generally constructed separately from a biochemical tank, the common surface load is 1m3/m2h, and the sedimentation speed cannot meet the separation of organic matters and filtrate in the existing sludge and sewage. Disclosure of Invention The invention aims to solve the problems that the surface load of a sedimentation device is low and the bottom volume of a sedimentation tank can only be used for sedimentation mud, so that the effective utilization rate is low. The invention is realized by the following scheme: the oxidation ditch flow state precipitation method comprises a sedimentation unit and a pushing device, wherein the sedimentation unit at least comprises a solid-liquid separator arranged between 2 stages, and the specific steps are as follows: The oxidation ditch flow state is pushed by adopting the self-flow speed of the oxidation ditch flow state or by a pushing device (or a pumping mode), so that the oxidation ditch flow state generates a certain circulation speed; The mud with a certain flow rate is separated layer by the solid-liquid separator in the sedimentation unit, a circulation is formed in a cavity area between adjacent solid-liquid separators, and the particle content of the mud in the next-stage solid-liquid separator is reduced; the supernatant liquid is discharged through an effluent weir of the sedimentation unit, and the organic matter mud liquid flows back into the sedimentation tank through a solid-liquid separator, so that solid-liquid separation is realized. Further, the circulation velocity of the oxidation ditch flow state is not lower than 0.4m/s. Further, the bottom of the sedimentation unit is at least 1m from the bottom of the sedimentation tank. The sedimentation unit comprises a connecting piece, a first solid-liquid separator, a second solid-liquid separator and a shell, wherein the connecting piece is arranged on the shell, the first solid-liquid separator and the second solid-liquid separator are arranged in the shell at intervals along the flowing direction of liquid, a turbulent flow cavity is formed between the first solid-liquid separator and the second solid-liquid separator, and the side wall of the turbulent flow cavity forms 20-50 degrees with the side wall of the first filter cavity. Further, a first filter cavity matched with the first solid-liquid separator in size and shape is arranged at the water inlet of the sedimentation unit, and the first solid-liquid separator is assembled in the first filter cavity. Further, the turbulent flow cavity comprises a first port and a second port, the aperture of the first port is matched with the first filter cavity, the second port is not smaller than the first port in size, the turbulent flow cavity is in an amplifying structure, and the second port is matched with the second solid-liquid separator in size. Further, the height of the first solid-liquid separator is 0.5-0.8 m, the vertical distance between the first port and the second port is at least 1m, and the height of the second solid-liquid separator is 0.5-1.0 m. Further, an effluent weir is arranged in the shell, and the distance between the effluent weir and the water outlet of the second solid-liquid separator is at least 0.8m. In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows: 1. compared with the traditional fixed static sedimentation, the surface load of the method at least reaches 4m3/m2h, and the method can realize higher sedimentation efficiency under smaller volume, so that the clear liquid and organic matters in the sedimentation tank are efficiently separated. 2. According to the scheme, the first solid-liquid separator and the second solid-liquid separator are arranged at intervals in the shell along the flowing direction of liquid, so that a turbulent flow cavity is formed between the first solid-liquid separator and the second solid-liquid separator, in the turbulent flow cavity, upward water flow and downward mud flow can form a dynamic balance suspension layer, mud liquid in the second solid-liquid separator can have lower granularity, the mud removal effect is integrally improved, and the effluent SS can be controlled within 10 mg/L. 3. The bottom space of the sedimentation tank can be used as a part of the biochemical tank, so that the tank capacity utilization rate is improved. Drawings FIG. 1 is a schematic illustration o